What time is the autumnal equinox in 2023?

The autumnal equinox in 2023 is September 23rd 14: 49.

On the day of the autumnal equinox, the sun shines directly to the longitude 180 (autumnal equinox), almost directly to the equator of the earth, and the whole world is as long as day and night. After the autumnal equinox, the direct point of the sun continues to move from the equator to the southern hemisphere, and all parts of the northern hemisphere begin to have shorter days and longer nights, that is, the day begins to be shorter than the night in a day, and the southern hemisphere is the opposite, so the autumnal equinox is also called declination.

In the same solar term, every year is 6 hours or 5 hours later than the previous year, and the leap year is 24 hours earlier. In this way, the date reflects that the same solar term remains unchanged or lags behind the previous year 1 day.

The leap year remains unchanged or is earlier than the previous year 1 day. In this way, the starting point of the same solar term has three different Gregorian calendar dates. Take the "autumnal equinox" as an example, there are three situations: September 22nd, September 23rd and September 24th, so the autumnal equinox in 2023 occurs on September 23rd.

Meteorological changes of autumnal equinox

At the autumnal equinox, China's Yangtze River basin and its vast areas to the north successively entered the autumn divided by "climatic average temperature", and the daily average temperature dropped below 22℃. The cold air mass in the north began to have some influence. The rainy season has just ended in most areas, with a cool breeze blowing gently. Autumn is crisp and the sky is high and the clouds are light.

After the autumnal equinox, the direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, but the ground lost more heat and the temperature dropped significantly. In the agricultural proverb, "an autumn rain leads to a cold" and "the autumn dew divides the night, and the night is cool". The characteristics of rapid cooling in autumn make "Sanqiu solar terms for health" particularly tense in the busy autumn harvest, autumn ploughing and autumn planting.